[Dovecot] Dovecot aspects of fighting spam

[William Blunn]

On 01/06/2010 14:42, Phil Howard wrote:
> I see no documents in the Dovecot documents wiki on how Dovecot
> features can be used in the fight against spam.  One hit came up in a
> search, and it was about how to fight spam in the MoinMoin Wiki itself
> (e.g. TextCHAs and such).
>
> I already asked in another thread about removing message files at the
> search from a designated "learn-spam" folder.  My next question would
> be how to automatically place detected spam into a specific folder for
> the user to access or ignore as they deem fit.  That would seem to me
> to be something for the deliver command and its -m option.  But this
> might be more of a Dovecot and MTA coordination issue, too (e.g. how
> to get the spam detection done in the MTA ... Postfix in my case ...
> to become a label of some sort that ends deciding the folder.  The -m
> option might be harder to get it dynamically set since it would be
> hard coded in master.cf for Postfix (so a variable has to be able to
> direct it to INBOX in this case).
>
> But maybe the "standard" way of doing this is to shim another program
> between the MTA (Postfix for me) and the LDA (Dovecot deliver) to
> dynamically add the -m option on the fly?  Lacking any other clever
> solution, this seems to me to be the way I could make it work.  Maybe
> there is a special header deliver could detect, such as "X-Spam: yes"?
>
> A wiki document on how Dovecot helps (or how to help Dovecot) in the
> fight against spam, I think, would be helpful.

Get your anti-spam software to add header records to the messages, then 
use Dovecot LDA Sieve to filter based on those header records.

Bill